Tap water · CO
Denver Water
EPA system ID CO0116001 · serves about 1,287,000 people. Every US utility must publish an annual water quality report — here’s the official one (2025), and below it, our plain-English translation.
Read the official report →What Denver Water found in 2025
25 detected analytes from the utility’s own annual report, hand-normalized — nothing was near or over a federal health-based limit.
| Detected | Level | Limit | % of limit | Status |
|---|---|---|---|---|
| Total Trihalomethanes (TTHM) | 35.5 ppb | 80 ppb | 44% | Within limit |
| Haloacetic Acids (HAA5s) | 19.5 ppb | 60 ppb | 33% | Within limit |
| Lead (90th percentile) | 4 ppb | 15 ppb | 27% | Within limit |
| Sulfate | 58,300 ppb | 250,000 ppb | 23% | Within limit |
| Fluoride | 619 ppb | 4,000 ppb | 15% | Within limit |
| Total Coliform (T. coli) | 0.5 Present/Absent | 5 Present/Absent | 10% | Within limit |
| Chloride | 24,000 ppb | 250,000 ppb | 10% | Within limit |
| Copper (90th percentile) | 60 ppb | 1,300 ppb | 5% | Within limit |
| Manganese | 1.9 ppb | 50 ppb | 4% | Within limit |
| Barium | 40.1 ppb | 2,000 ppb | 2% | Within limit |
| Nitrate as N | 104 ppb | 10,000 ppb | 1% | Within limit |
| Copper | 5.4 ppb | 1,000 ppb | 1% | Within limit |
| Chromium | 0.5 ppb | 100 ppb | 1% | Within limit |
| Zinc | 2.8 ppb | 5,000 ppb | 0% | Within limit |
| Total Hardness | 105,009 ppb | — | — | No federal limit |
| Alkalinity | 65,037 ppb | — | — | No federal limit |
| Calcium | 29,750 ppb | — | — | No federal limit |
| Sodium | 23,820 ppb | — | — | No federal limit |
| Magnesium | 7,460 ppb | — | — | No federal limit |
| Potassium | 1,985 ppb | — | — | No federal limit |
| Conductivity | 338 µs/cm | — | — | No federal limit |
| Aluminum | 31.4 ppb | — | — | No federal limit |
| Lithium — 2023 monitoring | 9.23 ppb | — | — | No federal limit |
| Nickel | 1 ppb | — | — | No federal limit |
| Turbidity (highest) | 0.17 NTU | — | — | No federal limit |
Levels and limits are as printed in the utility’s report (“limit” is the EPA MCL, action level, residual limit, or secondary guideline that applies to that row; “ND” = not detected). Utilities publish these reports annually — we re-check every covered utility each July, after the federal publication deadline. Detected doesn’t mean dangerous — most detections sit far below their limits. This is education, not medical advice.
Your tap, if it were a bottle
How Denver Water water stacks up against the bottled aisle
Same minerals, same units — the tap values below come from the utility’s report, placed next to the closest match in our bottled-water database.
| Mineral | Your tap | Closest bottled match |
|---|---|---|
| Calcium | 29.8 mg/L | Acqua Panna at 32.2 mg/L |
| Magnesium | 7.5 mg/L | Zephyrhills at 7.3 mg/L |
| Sodium | 23.8 mg/L | Buxton at 24 mg/L |
| Sulfate | 58.3 mg/L | Vichy Catalan at 48 mg/L |
| Chloride | 24 mg/L | Vöslauer at 23 mg/L |
| Potassium | 2 mg/L | Flow at 2 mg/L |
Tap values are the headline levels from the utility’s annual report (often a highest or average figure); bottled values are label- or report-derived. A closest match is a numeric comparison, not an equivalence or an endorsement.
Zip codes covered
80201 · 80202 · 80203 · 80204 · 80205 · 80206 · 80207 · 80209 · 80210 · 80211 · 80217 · 80218 · 80219 · 80220 · 80222 · 80223 · 80224 · 80230 · 80236 · 80237 · 80238 · 80239 · 80248 · 80249 · 80250 · 80264 · 80266 · 80290 · 80293 · 80294
Boundary zips partially served by other systems are deliberately unlisted — check your exact zip.